Determination of the primordial helium abundance from radio recombination line observations

Details Determination of the primordial helium abundance from radio recombination line observations Determination of the primordial helium abundance from radio recombination line observations

Oct 2009

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2009astl...35..670t&link_type=abstract

Astronomy Letters, Volume 35, Issue 10, pp.670-678

Astronomy and Astrophysics

Astronomy

Scientific paper

We describe a method for determining the primordial helium abundance ( Y p) from radio recombination lines and present results of the first stage of our measurements. We analyze the observational data for hydrogen and helium radio recombination lines from six Galactic H II regions obtained at different times. We have found Y p = 25.2-25.5% with an error of ±0.9% from four sources.

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